[VS2008 - Compact Framework] How to prevent a closed form from been disposed

[steve_9496613]

Hi #realJSOP, I have declared that object STATIC inside a form that is alive untill the app is closed, why it is not enough? Thanks

[dan sh]

What controls do you have on the form? Ones which are directly on the Form i.e controls whose parent is the form. And you are disposing anything on the form? Perhaps posting the code on the form may help.

"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]

[dan sh]

I am not sure if I understand this. What I meant was that if I create a static object on the form, it has to be alive until that form (not application) is.

"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]

[realJSOP]

When the modal form goes out of scope (closes), you can't access anything declared inside it because the form is no longer available/in scope.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013

[steve_9496613]

Sorry, I was not clear. I understood what you said, FormMain, in wich I declared a FormDateTime instance, is always in the background and is never closed.

[steve_9496613]

Clear. The form is used only to update date and time, it doesn't store any information.

[realJSOP]

Declare an EXTERNAL static class that the form can access

public static class Globals
{
public static MyDateTime { get; set; }
}

In your form, when you close it: Globals.MyDateTime = DateTime.Now; When your form closes, examine Globals.MyDateTime to ensure it's the expected value. The next time you open the form, the value will be the same as the last time you opened the form, and when you close it agaim, set Globals.MyDateTime again. The Globals.DateTime will be available everywhere else in the app as well.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013

[realJSOP]

I have no idea what you really want. I told you to make the form modelss so it never disposes, and you said it can't be modelss. Then I suggested that you make abn external statuic class because you wanted the form to be model. WTF do you actually want to do?

".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013

[dan sh]

Yes, that is what I said as well.

"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]

[steve_9496613]

In the form there are: 3 BeeMobile.TransparentControls.TImageButton 2 BeeMobile.TransparentControls.TLabel 2 BeeMobile.RoundTextBox.RoundTextBox 1 BeeMobile.MonthCalendar.MonthCalendar 1 BeeMobile.iWheel.iWheel 2 System.Windows.Forms.Timer For what I know, I do not dispose any control voluntarily... Here is the code on the form:

using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

//alias
using LangD = SA7.Cl_LangData;
using Gr = SA7.Cl_Graphics;
using Globals = SA7.Cl_Globals;

namespace SA7
{
public partial class FormDateTime : Form
{

private bool FormDateTime\_FirstShow = true;     // flag: first call to FormDateTime\_Load

Cl\_DateTime Tempo = new Cl\_DateTime();


public struct SYSTEMTIME
{
  public short wYear;
  public short wMonth;
  public short wDayOfWeek;
  public short wDay;
  public short wHour;
  public short wMinute;
  public short wSecond;
  public short wMilliseconds;
}

//functions to read and to set time
\[DllImport("coredll.dll")\]
private extern static void GetSystemTime(ref SYSTEMTIME lpSystemTime);

\[DllImport("coredll.dll")\]
private extern static uint SetSystemTime(ref SYSTEMTIME lpSystemTime);

//---------------------------------------------------------------------------------

public FormDateTime()
{
  InitializeComponent();
  this.Location = new Point((800 - this.Width) / 2, (480 - this.Height) / 2);
}
//---------------------------------------------------------------------------------.

private void FormDateTime\_Load(object sender, EventArgs e)
{
  if (FormDateTime\_FirstShow) {

    FormDateTime\_FirstShow = false;
  }

  CtrlsDesc();
  UpdateDateTime();
  ExitTr.Enabled = true;
}
//---------------------------------------------------------------------------------

private void FormDateTime\_Paint(object sender, PaintEventArgs e)
{
  //draw window border
  Gr.DrawFrContour(e, 0, 1, 1, this.Width - 1, this.Height - 1);
}
//---------------------------------------------------------------------------------

//update strings
public void CtrlsDesc()
{
  AbortBt.Text = FormMain.LF.GetStr(LangD.LANG\_Win, LangD.LANG\_WinExit);
  UpdateBt.Text = F

[steve_9496613]

I want to understand. I have made what you suggested and now my app is running with the form instance declared in a static class, sometime I push buttons to see if I get the exception. But I wanted to know why this is better considering that I had declared the form static instance inside a form that is never closed until the application is running. WTF...

[steve_9496613]

Thanks for the sample #realJSOP. Actually I don't need to save the exact moment the form is closed. This form is used to give the user the possibility to change the time and/or the date of the device (Windows CE based) on which the app is running and it is not used to change a variable used somewere else in the app. So I declared an external static class and in this class I declared my form instance:

public static class Cl_Forms
{
public static FormDateTime Suc3 = new FormDateTime();
}

As you suggest, in this way the form shown in a modal way should be static and should not be disposed until the app is running. Now I'm testing this solution. Unfortunately the exception occurred rarely and randomly and it was not easy to reproduce it.